ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION

查看全文 作　　者：[1]J.F.Li;[2]Z.Q.Zheng;[2]C.Y.Tan;[2]S.C.Li;[3]Z.Zhang;[4]J.Q.Zhang 机构地区：[1]CollegeofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China//DepartmentofChemistry,ZhejiangUniversity,Hangzhou310027,China;[2]CollegeofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China;[3]DepartmentofChemistry,ZhejiangUniversity,Hangzhou310027,China;[4]DepartmentofChemistry,ZhejiangUniversity,Hangzhou310027,China//StateKeyLaboratoryforCorrosionand.Protection,InstituteofMetalResearch,TheChineseAcademy 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2004年第17卷第6期,共8页 摘　　要：The corrosion behavior and electrochemical impedance spectroscopy (EIS) features of 8090 Al-Li alloys in EXCO solution were investigated, and the EIS was simulated using an equivalent circuit. At the beginning of immersion in EXCO solution, the EIS is comprised by a depressed capacitive arc at high-mediate frequency and an inductive arc at low frequency, and the inductive component decreases and disappears with im- mersion time. Once exfoliation or severe pitting corrosion is produced, two capacitive arcs appear in the EIS. These two capacitive arcs are originated from the two parts of the corroded alloy surface, the original flat alloy surface and the new inter-face exposed to the aggressive EXCO solution due to the exfoliation or pitting corrosion. Some corrosion development features of 8090 Al-Li alloys in EXCO solution can be obtained through simulated EIS information. 关 键 词：EXCO解 8090铝-锂合金 电化学 光谱学 腐蚀特征